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Parent Company Statements - Statements of Cash Flows (Details) - USD ($) $ in Thousands | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Net income | $ 84,242 | $ 86,135 | $ 81,012
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Share-based compensation expense | 3,942 | 2,814 | 1,828
Increase (decrease) in other liabilities | (11,778) | 2,006 | 1,173
Net cash provided by operating activities | 87,991 | 87,887 | 89,234
Investing activities: |  |  |
Net cash used in investing activities | (61,971) | (152,560) | (395,468)
Financing activities |  |  |
Repayment of subordinated notes | (30,000) | 0 | 0
Payments Related to Tax Withholding for Share-based Compensation | 347 | 0 | 0
Net cash (used in) provided by financing activities | (3,354) | 61,660 | 217,994
Increase (decrease) in cash and cash equivalents | 22,666 | (3,013) | (88,240)
Parent Company |  |  |
Net income | 84,242 | 86,135 | 81,012
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Undistributed income of subsidiaries | (26,699) | (30,692) | (25,561)
Decrease (increase) in other assets | 205 | (3,425) | (182)
Increase (decrease) in other liabilities | 475 | (2,524) | 485
Net cash provided by operating activities | 60,344 | 52,308 | 57,582
Proceeds from Sale of Available-for-sale Securities, Equity | 2,265 | 0 | 0
Investing activities: |  |  |
Repayment of investments in and advances to subsidiaries | 0 | 15,000 | 10,000
Net cash used in investing activities | 2,265 | 15,000 | 10,000
Financing activities |  |  |
Cash dividends paid | (57,493) | (57,653) | (57,776)
Cash payment for fractional shares | (6) | (4) | (3)
Payments Related to Tax Withholding for Share-based Compensation | (347) | 0 | 0
Net cash (used in) provided by financing activities | (95,224) | (57,657) | (63,837)
Increase (decrease) in cash and cash equivalents | (32,615) | 9,651 | 3,745
Cash at beginning of year | 112,067 | 102,416 | 98,671
Cash at end of year | 79,452 | 112,067 | 102,416
Parent Company |  |  |
Adjustments to reconcile net income to net cash provided by operating activities: |  |  |
Compensation expense for issuance of treasury shares to directors | 1,241 | 950 | 963
Share-based compensation expense | 2,701 | 1,864 | 865
Available-for-sale Securities, Gross Realized Gain (Loss), Excluding Other than Temporary Impairments | (1,821) | 0 | 0
Treasury Stock, Common [Member] |  |  |
Financing activities |  |  |
Payments for Repurchase of Equity | $ 7,378 | $ 0 | $ 6,058

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